<template>
  <div class="login-container">
    <el-form
      ref="loginForm"
      :model="loginForm"
      :rules="loginRules"
      class="login-form"
      auto-complete="on"
      label-position="left"
    >
      <div class="title-container">
        <h3 class="title">后台管理</h3>
      </div>
      
      <el-form-item prop="username">
        <span class="svg-container">
          <svg-icon icon-class="user" />
        </span>
        <el-input
          ref="username"
          v-model="loginForm.username"
          placeholder="Username"
          name="username"
          type="text"
          tabindex="1"
          auto-complete="on"
        />
      </el-form-item>
      
      <el-form-item prop="password">
        <span class="svg-container">
          <svg-icon icon-class="password" />
        </span>
        <el-input
          :key="passwordType"
          ref="password"
          v-model="loginForm.password"
          :type="passwordType"
          placeholder="Password"
          name="password"
          tabindex="2"
          auto-complete="on"
          @keyup.enter.native="handleLogin"
        />
        <span class="show-pwd" @click="showPwd">
          <svg-icon :icon-class="passwordType === 'password' ? 'eye' : 'eye-open'" />
        </span>
      </el-form-item>
      
      <el-button
        :style="{ width: '100%', marginBottom: '30px' }"
        :loading="loading"
        type="primary"
        @click.native.prevent="handleLogin"
      >
        登录
      </el-button>
    </el-form>
  </div>
</template>

<script>
  import { validUsername } from "@/utils/validate"
  
  export default {
    name: "Login",
    data() {
      const validateUsername = (rule, value, callback) => {
        if (!validUsername(value)) {
          // callback(new Error("Please enter the correct user name"))
          callback()
        }
        else {
          callback()
        }
      }
      const validatePassword = (rule, value, callback) => {
        if (value.length < 6) {
          // callback(new Error("The password can not be less than 6 digits"))
          callback()
        }
        else {
          callback()
        }
      }
      return {
        loginForm: {
          username: "admin",
          password: "111111"
        },
        loginRules: {
          username: [{ required: true, trigger: "blur", validator: validateUsername }],
          password: [{ required: true, trigger: "blur", validator: validatePassword }]
        },
        loading: false,
        passwordType: "password",
        redirect: undefined
      }
    },
    watch: {
      $route: {
        handler: function (route) {
          this.redirect = route.query && route.query.redirect
        },
        immediate: true
      }
    },
    methods: {
      showPwd() {
        if (this.passwordType === "password") {
          this.passwordType = ""
        }
        else {
          this.passwordType = "password"
        }
        this.$nextTick(() => {
          this.$refs.password.focus()
        })
      },
      handleLogin() {
        this.$refs.loginForm.validate(valid => {
          if (valid) {
            this.loading = true
            this.$store.dispatch("user/login", this.loginForm).then(() => {
              this.$router.push({ path: this.redirect || "/" })
              this.loading = false
            }).catch(() => {
              this.loading = false
            })
          }
          else {
            console.log("error submit!!")
            return false
          }
        })
      }
    }
  }
</script>

<style lang="scss">
  $bg: #283443;
  $light_gray: #fff;
  $cursor: #fff;
  
  @supports (-webkit-mask: none) and (not (cater-color: $cursor)) {
    .login-container .el-input input {
      color: $cursor;
    }
  }
  
  /* reset element-ui css */
  .login-container {
    .el-input {
      display: inline-block;
      height: 47px;
      width: 85%;
      
      input {
        background: transparent;
        border: 0px;
        -webkit-appearance: none;
        border-radius: 0px;
        padding: 12px 5px 12px 15px;
        color: $light_gray;
        height: 47px;
        caret-color: $cursor;
        
        &:-webkit-autofill {
          box-shadow: 0 0 0px 1000px $bg inset !important;
          -webkit-text-fill-color: $cursor !important;
        }
      }
    }
    
    .el-form-item {
      border: 1px solid rgba(255, 255, 255, 0.1);
      background: rgba(0, 0, 0, 0.1);
      border-radius: 5px;
      color: #454545;
    }
  }
</style>

<style lang="scss" scoped>
  $bg: #2d3a4b;
  $dark_gray: #889aa4;
  $light_gray: #eee;
  
  .login-container {
    min-height: 100%;
    width: 100%;
    background-color: $bg;
    overflow: hidden;
    
    .login-form {
      position: relative;
      width: 520px;
      max-width: 100%;
      padding: 160px 35px 0;
      margin: 0 auto;
      overflow: hidden;
    }
    
    .tips {
      font-size: 14px;
      color: #fff;
      margin-bottom: 10px;
      
      span {
        &:first-of-type {
          margin-right: 16px;
        }
      }
    }
    
    .svg-container {
      padding: 6px 5px 6px 15px;
      color: $dark_gray;
      vertical-align: middle;
      width: 30px;
      display: inline-block;
    }
    
    .title-container {
      position: relative;
      
      .title {
        font-size: 26px;
        color: $light_gray;
        margin: 0 auto 40px auto;
        text-align: center;
        font-weight: bold;
      }
    }
    
    .show-pwd {
      position: absolute;
      right: 10px;
      top: 7px;
      font-size: 16px;
      color: $dark_gray;
      cursor: pointer;
      user-select: none;
    }
  }
</style>
